GB1413153A - Method and control circuit for liquid level control system - Google Patents

Method and control circuit for liquid level control system

Info

Publication number
GB1413153A
GB1413153A GB5390872A GB5390872A GB1413153A GB 1413153 A GB1413153 A GB 1413153A GB 5390872 A GB5390872 A GB 5390872A GB 5390872 A GB5390872 A GB 5390872A GB 1413153 A GB1413153 A GB 1413153A
Authority
GB
United Kingdom
Prior art keywords
liquid level
circuit
level control
control system
nov
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5390872A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Creears Corp T H
Original Assignee
Creears Corp T H
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Creears Corp T H filed Critical Creears Corp T H
Publication of GB1413153A publication Critical patent/GB1413153A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7287—Liquid level responsive or maintaining systems
    • Y10T137/7306—Electrical characteristic sensing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7287—Liquid level responsive or maintaining systems
    • Y10T137/731—With control fluid connection at desired liquid level

Landscapes

  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

1413153 Liquid level control; indicating liquid level T H CREEARS CORP 22 Nov 1972 [22 Nov 1971] 53908/72 Heading G1H and GIN [Also in Division H3] In a liquid level control system in which the liquid level is sensed by completing an A.C. circuit to ground through a probe 16, the arrangement is such that a gate circuit 38, 40, 42 biases an S.C.R. device 34 when the probe 16 contacts the liquid 20 to energize a pump control 22. If long lines 14 are used, a large stray capacitance occurs and switches 46, 47 may be operated to include a resistance to limit the discharge current. In a further embodiment, Fig, 4 (not shown), a diode rectifies the A.C. current and a capacitor smoothes the D.C. voltage and, when the circuit is open, biases current flow through a uni-directional device 50 and resistors 38, 58 to create a reverse bias and prevent the gate triggering.
GB5390872A 1971-11-22 1972-11-22 Method and control circuit for liquid level control system Expired GB1413153A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20107471A 1971-11-22 1971-11-22

Publications (1)

Publication Number Publication Date
GB1413153A true GB1413153A (en) 1975-11-05

Family

ID=22744385

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5390872A Expired GB1413153A (en) 1971-11-22 1972-11-22 Method and control circuit for liquid level control system

Country Status (4)

Country Link
US (1) US3772531A (en)
JP (1) JPS56802B2 (en)
CA (1) CA965171A (en)
GB (1) GB1413153A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180939A (en) * 1985-09-25 1987-04-08 Partridge Wilson And Company L Equipment for detecting when the level of a liquid in a container drops below a predetermined level

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7413475A (en) * 1974-10-14 1976-04-20 Mattheus Gijsbertus Jozef Arts LEVEL CONTROL.
US4105367A (en) * 1976-10-18 1978-08-08 Sta-Rite Industries Liquid level sensing circuit
US4205237A (en) * 1977-12-16 1980-05-27 Nartron Corporation Liquid level sensor, pump system means and circuit means
AU4608879A (en) * 1978-04-21 1979-10-25 Noack, J. Sheet metal cold forming apparatus
US4213340A (en) * 1978-11-13 1980-07-22 Cheng Sheng Hsiung Oil-water interfacial detector
US7191647B2 (en) * 2003-10-30 2007-03-20 Perkinelmer Las, Inc. Method and apparatus to reject electrical interference in a capacitive liquid level sensor system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206615A (en) * 1962-12-27 1965-09-14 Pointe Joseph Leo La Liquid detector device
US3279379A (en) * 1964-01-21 1966-10-18 Regent Controls Inc Liquid level control
US3312936A (en) * 1964-04-10 1967-04-04 Gen Motors Corp Electrical fluid level indicating system
US3477460A (en) * 1965-08-02 1969-11-11 Mallory & Co Inc P R Fluid level control system
BE756799A (en) * 1969-09-29 1971-03-01 Addressograph Multigraph LIQUID LEVEL CONTROL DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180939A (en) * 1985-09-25 1987-04-08 Partridge Wilson And Company L Equipment for detecting when the level of a liquid in a container drops below a predetermined level

Also Published As

Publication number Publication date
JPS4863190A (en) 1973-09-03
JPS56802B2 (en) 1981-01-09
CA965171A (en) 1975-03-25
US3772531A (en) 1973-11-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee